The primary criticism of direct impingement is that fouling and debris from expended gunpowder is blown directly into the breech. As the superheated combustion gas travels down the tube, it expands and cools. This cooling causes vaporized matter to condense as it cools depositing a much greater volume of solids into the operating components of the action. The increased fouling can cause malfunctions if the rifle is not cleaned as frequently as should be. The amount of sooting deposits tends to vary with powder specification, caliber, and gas port design.
[edit]Production and users

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Kevin Costner’s oil spill clean up machine & patent
At Igor we deal with intellectual property rights every week as we search thousands of trademarks while naming products for our clients. It’s not enough to have a good idea, you need one that you can legally own. Kevin Costner’s much publicized Ocean Therapy Solutions company developed a soon-to-be-implemented oil and water separation machine. BP [...]

At Igor we deal with intellectual property rights every week as we search thousands of trademarks while naming products for our clients. It’s not enough to have a good idea, you need one that you can legally own.

Kevin Costner’s much publicized Ocean Therapy Solutions company developed a soon-to-be-implemented oil and water separation machine. BP has ordered 32 of them thus far to help deal with their latest environmental disaster.

You can view the patent filing, description and drawings for Costner’s oil spill clean up machine here. Click on the pic in the upper right corner to see the full diagrams.

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